linux-kernel - Re: [PATCH] maple_tree: Fix use of node for global range in mas_wr_spanning

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Date:   Tue, 5 Jul 2022 19:55:35 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Liam Howlett <liam.howlett@...cle.com>
Cc:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Yu Zhao <yuzhao@...gle.com>
Subject: Re: [PATCH] maple_tree: Fix use of node for global range in
 mas_wr_spanning_store()

On Wed, 6 Jul 2022 02:05:37 +0000 Liam Howlett <liam.howlett@...cle.com> wrote:

> When writing a range with a NULL which expands to 0 - ULONG_MAX, don't
> use a node to store this value.  Instead, call mas_new_root() which will
> set the tree pointer to NULL and free all the nodes.
> 
> Fix a comment for the allocations in mas_wr_spanning_store().
> 
> Add mas_node_count_gfp() and use it to clean up mas_preallocate().
> 
> Clean up mas_preallocate() and ensure the ma_state is safe on return.
> 
> Update maple_tree.h to set alloc = NULL.

Cool.

How are we looking now?  Any known issues still being worked on?